From A+ to D- in such a short time

All of my life growing up I was a very positive person, in fact I even have A+ blood type! I would always assume the best out of any situation and expect nothing less. Some may have called me lucky because more often than not things would go my way. I credited much of my success to having a great attitude and always expecting things to work out. All I needed to do was supply enough energy into the thing and I could do what ever it was regardless of the apparent facts. And then the depression came and I wonder if it is possible to do the most minor of tasks without being sidelined by some tiny obstacle or mishap. Now I can do the smallest thing wrong and my immediate reaction is to throw my hands up and give up. It has become so difficult to plow through things that are in the way that I simply retreat and try to go into hiding hoping that it will somehow take care of itself, which it inevitably does not do. That leaves me with an even lower assessment of my worth making it even more difficult to face the next task. Self fulfilling prophecy is one of our trademarks that we battle daily.